Revert SoftFloat changes #4218

Job	Run time
Prepare CodeQL unit test matrix	6s
Run unit tests (c, 2.21.4, codeql-cli/v2.21.4, codeql-bundle-v2.21.4, ubuntu-latest-xl, codeql-cl...	4m 33s
Run unit tests (cpp, 2.21.4, codeql-cli/v2.21.4, codeql-bundle-v2.21.4, ubuntu-latest-xl, codeql-...	4m 7s
Validate test results	4s
	8m 50s

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